poolside alarm
Download
Skip this Video
Download Presentation
Poolside Alarm

Loading in 2 Seconds...

play fullscreen
1 / 95

Poolside Alarm - PowerPoint PPT Presentation


  • 152 Views
  • Uploaded on

Poolside Alarm. Jay Bombien – BSEE Lead Report Manager Darren Pallesen- BSEE Lead Project Integrator Louis Chatfield- BSEE Lead Presentation Manager Peter Brunner- BSEE Lead System Designer Milja Cumbo- BSEE Lead Manufacturing Mgr. Major Functions and Features. Functions:

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Poolside Alarm' - osric


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
poolside alarm
Poolside Alarm
  • Jay Bombien – BSEE
    • Lead Report Manager
  • Darren Pallesen- BSEE
    • Lead Project Integrator
  • Louis Chatfield- BSEE
    • Lead Presentation Manager
  • Peter Brunner- BSEE
    • Lead System Designer
  • Milja Cumbo- BSEE
    • Lead Manufacturing Mgr
major functions and features
Major Functions and Features
  • Functions:
    • Monitor a pool for potential hazardous situations
    • Loud audible alarms when a child falls in unnoticeably
  • Features:
    • Outdoor unit will display water temp, air temp, and low battery indicator
    • Solar cells on poolside unit to keep outdoor battery charged
    • User Control On/Off
poolside alarm1
Poolside Alarm
  • The device will monitor a pool for potential hazardous situations. (i.e. child falling in)
  • Indoor unit will display water temp, air temp, and low battery indicator.
  • Wireless home receiver and display unit with loud audible signal.
  • Solar cells on poolside unit to keep outdoor battery charged.
poolside alarm block assignment
Poolside Alarm Block Assignment

Louis

Peter

Jay

Darren

Milja

Outdoor

Indoor

Power Supply

Power Supply

Air / Water

Sensor

Alarm

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

standard requirements
Standard Requirements

System Standard Requirements:

Market:

  • Est. Total Market Size $1,000,000
  • Est. Annual Vol. 3,000
  • Min. List Price $250

Manufacturing:

  • Min. Total Parts Count 160
  • Max. Unique Parts Count 50
  • Max. Parts & Materials Cost $175
  • Max. MFG Assembly / Test Cost $50

Life Cycle:

  • Est. Max. Production Lifetime 10 years
  • Product Life Reliability in MTBF 1.99 years
  • Full Warranty Period 30 days
slide7

Standard Requirements

Power Sources

Indoor:

  • Source(1): 120Vac 108V to 138V

Frequency Range: 57-63Hz

AC Power Dissipation: 400 mW

Plugs: Type B (Flat blades with round grounding pin)

2.1 mm male-to-female DC Plug

  • Source(2): 3AA 3.9V to 4.8V
  • Battery Power: 2000 mAh

Outdoor:

  • Source(1): Solar Cell 13.3V to 16.2V
  • Source(2): 8AA 10.8V to 12.6V
  • Battery Power 2000 mAh

Max. Total Power 20W

performance requirements
Performance Requirements

Mechanical:

  • Max. Product Vol. 11,000
  • Max. Shipping Container Vol. 8,000
  • Max. Product Mass 5 kg
  • Max. # of boards 3
  • Max. Total PCB Area 425 cm2
  • Max. Shock Force
    • Indoor 50 G’s
    • Outdoor 10 G’s
  • Max. Shock Repetitions / Year 15

Environmental:

  • Operating Ambient Temp. Range 5°C to 50°
  • Operating Ambient Humidity Range 0%Rh to 100%Rh
  • Operating Altitude Range 0.5 to 1.5 ATM
  • Storage Ambient Temp. Range -20°C to 80°C
  • Storage Ambient Humidity Range 0%Rh to 100%Rh
  • Storage / Shipping Altitude Range -100m to 3000m
  • Max Storage Duration 3 years
safety standards
Safety Standards
  • UL 464 - Audible Signal Appliances
    • Electrically and electronically operated bells, buzzers, horns, and similar audible signal appliances intended for indoor or outdoor locations.
  • UL 1703 - Flat-Plate Photovoltaic Modules and Panels
    • Flat-plate photovoltaic modules used as either freestanding or attached to buildings
  • PS 128-01, Provisional Specification for Pool Alarms
    • Alarms sound at poolside and in adjacent buildings when a minimum weight of 18 lbs hits the water.
    • Alarms sound at poolside and in adjacent buildings that a minimum sound of 80dB at 100ft is possible
  • IEC 61558-1
    • Safety of power transformers, power supply units and similar devices
key risk areas
Key Risk Areas
  • Developing and implementing a wave sensor could be very complicated
  • Not much market on workable child safety poolside devices
  • Difficulty to present prototype.
  • Sensor Interfacing
  • Power Supply interfacing with step-down transformer
  • Outdoor product requiring waterproofing
  • Needs to be near foolproof, should not go off with falling branches, excessive wind, etc.
emc standard summary table
EMC Standard Summary Table

US/FCC: 47 CFR 15 - Radio Frequency Devices 47 CFR 18 - Industrial Scientific and Medical Equipment

61000-3-3 EMC Part 3: Limits - Section 3: low-voltage supplies <16A 61000-4-2 EMC Part 4: Test/measurement techniques - Section 2: ESD immunity tests 61000-4-3 EMC Part 4: Test/measurement techniques - Section 3: Radiated radiofrequency immunity 61000-4-6 EMC Part 4: Test/measurement techniques - Section 6: Conducted radiofrequency immunity 61000-4-11 EMC Part 4: Test/measurement techniques - Section 11: Voltage dips, short interruptions and variations

CISPR:11 Limits and methods of measurement for Industrial, Scientific and Medical Equipment 16 Specifications for Radio Interference Measuring Apparatus and Measurement Methods 22 Limits and Methods of Measurements of Radio Interference of Information Equipment

slide12

Design Plan Summary

Total Manpower

Estimated: 1750 hrs Available: 975 hrs

Total Material Cost

Estimated: $337 Available: $350

Percentage of total manpower

System Design Tasks: 15%

Detailed Design Tasks: 35%

Verification Tasks: 15%

Documentation Tasks: 35%

prototype summary slide
Prototype Summary Slide
  • Total # of bds
    • 8 bds – 1 for Each Block
  • Total PCB area (cm2)
    • B1(40), B2(65), B3(40), B4(50), B5(50),

B6(40), B7(50), B8(90)

    • Total = 425
  • Technology:
    • Perfboard, PCB, Breadboard
    • Soldering & Wirewrap
poolside alarm block assignment1
Poolside Alarm Block Assignment

Peter

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

slide17

Functional Purpose

  • To receive Infra red rays from the sun

to charge the solar panels

  • To recharge the battery through a regulator when it loses 10% of its power.
  • To output the required regulated voltage for the other block power inputs
performance requirements1
Performance Requirements

Electrical Interfaces:

  • Signal Type: Power.
  • Power Consumption: 2W
  • Signal Direction: Input / Output.
  • Battery Type: 8AA
  • Output Voltage:
      • Nominal: 3.3 Range: 3-3.6
      • Nominal: 12 Range: 10.8-13.2
      • Nominal: 9 Range: 8.1-9.9
  • Output Current max. : 1 A
  • Input Voltage:
      • Nominal: 15.4 Range: 13.3 – 16.4
  • Input Current max: 120 mA

Safety Standard:

  • UL 1703 - Flat-Plate Photovoltaic Modules and Panels

EMC Standard:

  • EMC 61000-3-3: Limitation of voltage fluctuations and flicker in low-voltage supplies <16A
standard requirements1
Mechanical

Block cost <$65

Parts count <15

Unique parts count <6

PCB Area 40 cm2

Environment:

Operating temperature range 5 to 55 C

Storage temperature range -20C to 65C

Operating humidity 0 to 100%

Life Cycle

Reliability MTBF 237.3 years

R(1 warranty) 99.7%

Disposal Throw away

Percent Allocations 26% of cost

10% of parts

9% of PCB area

Standard Requirements
block assignment
Block Assignment

Sun

15.4V

12V

Charging Circuit

Battery

Switching Regulator

3.3V

9V

Other Blocks

slide22

Parts Count Reliability

  • Total Fits = 480.77, Total MTBF (yrs) = 237.3
  • R(30 day warranty) = e^(-0.8/237.3) * 100% = 99.7%
  • Dominant Failure part is the Flexible Solar Panel. Not much can be done to improve this part for higher reliability.
poolside alarm block assignment2
Poolside Alarm Block Assignment

Jay

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

indoor power supply
Indoor Power Supply

Block Description and Purpose:

  • Electrical device that will transform the standard wall electricity (AC) to lower voltages (DC).
  • The DC voltage will power the indoor control panel, RF transceiver, and the alarm.
  • Will charge the battery unit used as the backup power system.
slide27
Block cost <$25

Parts count <18

Unique parts count <8

PCB Area 65 cm2

Power consumption 3 W

Operating temperature range 5 to 55 C

Storage temperature range -20C to 65C

Reliability MTBF 7.8 years

Operating humidity 0 to 100%

Disposal Throw away

Percent Allocation:

Cost: 10.0%

Parts: 11.25%

PCB: 15.29%

Indoor Power Supply

Standard Requirements

slide28

Indoor Power Supply

Performance Requirements

* Electrical Interfaces:

  • Signal Type:Power
  • Signal Direction: Input / Output.
  • Output Voltage: Nominal: 3.3 VDC (Range: 3.0 – 3.6 VDC)
  • V-Ripple max. :100 mV
  • Output Current max. : 1 A
  • Input Voltage: Nominal: 120 VAC (Range:108 - 138 VAC)
  • Input Current max:1.038 A

Safety Standard:

  • IEC 61558-1: Safety of power transformers, power supply units and similar devices EMC Standard:

EMC Standard:

  • EMC 61000-3-3: Limitation of voltage fluctuations and flicker in low- voltage supplies <16A
slide29

Indoor Power Supply

AC/DC

Converter Block

DC Regulator

Circuit

Battery

Charger Circuit

Converter/Charger

Switch

Alarm

Battery

DC Regulator

Circuit

Indoor MPU and Display

slide31

Indoor Power Supply

Prototyping Plan

slide32

Indoor Power Supply

Block Parts Count Reliability

  • Total FITs: 14620 Total MTBF (years): 7.8
  • The MOS Digital ICs are most unreliable
  • R = 90.25%
slide33
Indoor MPU and Display

Darren Pallesen

poolside alarm block assignment3
Poolside Alarm Block Assignment

Darren

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

indoor mpu and display block description
Indoor MPU and DisplayBlock Description
  • Allows user to turn the unit on/off. Also allows user to deactivate both alarms from inside.
  • Receives signals from the transceiver (alarm activated, alarm deactivated from outside, outdoor unit power off, and low battery).
  • Transfers signals to alarm (activate/deactivate).
  • Sends signals to the indoor display unit for user visibility (power on, low battery, alarm activated).
indoor mpu and display performance requirements
Indoor MPU and DisplayPerformance Requirements

User Indicators and Displays:

  • Indicator Parameters: Power On, Outdoor Unit Power Off, Low Battery, Alarm Activated.
  • Indicator Color and Type: Amber LED, Green LED, Green LED, Red LEDs.
  • Indicator Viewing Environment: Indoor Lighting, Complete Darkness.

Electrical Interfaces:

  • Power Consumption: 1 W
  • Signal Types: DC Power, Digital.
  • Signal Directions: Input, Bi-Directional, Output.
  • Input Nominal Voltage: 3.3 VDC Range: 3.0 VDC – 3.3 VDC
  • Input Current Max: 24 mA
  • Output Nominal Voltage: 3.3 VDC Range: 3.0 VDC – 3.3 VDC
  • Output Current Max: 24 mA

EMC Standard:

  • 61000-4-2 EMC Part 4: Test/measurement techniques - Section 2: ESD immunity tests
indoor mpu and display standard requirements
Mechanical:

Block Cost < $25

Parts Count < 16

Unique Parts Count < 5

PCB Area 40 cm2

Environmental:

Operating temperature range 5 to 55 C

Storage temperature range -20C to 65C

Operating humidity 0 to 100%

Life Cycle:

MTBF(years) 183.53 years

R(warranty) 99.57%

Disposal Throw away

Percent Allocation:

Block Cost 10% of Total

Parts Count 10% of Total

PCB Area 9% of Total

Indoor MPU and DisplayStandard Requirements
indoor mpu and display block detail
Indoor MPU and DisplayBlock Detail

Alarm Turn-Off

User

Control

Power Supply

Power On / Off

3.3V

Alarm Activated

MPU

RF

Transceiver

Alarm Turn-Off

Alarm On / Off

Low Battery

Alarm

Outdoor Unit Power Off

Alarm Turn-Off

Outdoor

Unit

Off

Digital Signals

Low

Battery

Alarm

Activated

Power On

Analog Signals

Display (LED Indicators)

indoor mpu and display parts count reliability estimation
Indoor MPU and DisplayParts Count Reliability Estimation
  • MTBF(years) = 183.53
  • R(30 day warranty) = e^-(0.8 / 183.53) = 0.9957 = 99.57%
  • The dominant part for unreliability is the CPLD chip. Not much can be done to improve the reliability of this part because of the amount of gates in the IC.
slide42
Wave Sensor

Jay Bombien

poolside alarm block assignment4
Poolside Alarm Block Assignment

Jay

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

wave sensor
Wave Sensor

Block Description and Purpose:

  • Sensing unit that will detect the presence of wave motion in the pool.
  • This signal will be passed through an A/D converter and then on to the RF transceiver.
wave sensor1
Block cost <$20

Parts count <12

Unique parts count <2

PCB Area 30 cm2

Power consumption <2.25 W

Operating temperature range 5 to 55 C

Storage temperature range -20C to 65C

Reliability MTBF 9.9 years

Operating humidity 0 to 100%

Disposal Throw away

Percent Allocation:

Cost: 8.0%

Parts: 7.5%

PCB: 7.05%

Wave Sensor

Standard Requirements

wave sensor2
Wave Sensor

Performance Requirements

* Electrical Interface:

  • Signal Type: Power.
  • Signal Direction: Input
  • Input Nominal Voltage: 9 VDC (Range: 8.1 – 9.9 VDC)
  • Input Current max: 0.5 A

* Data Interface:

  • Signal Type: Digital
  • Signal Direction: Output
  • Input Nominal Voltage: 1.4 VDC (Range: 0.8 – 2.0 VDC)
  • Input Current max: 5 uA

EMC Standard:

  • 61000-3-3 EMC Part 3: Limits - Section 3: Limitation of voltage fluctuations and flicker in low-voltage supplies <16A
  • 61000-4-11 EMC Part 4: Test/measurement techniques - Section 11: Voltage dips, short interruptions and variations
wave sensor3
Wave Sensor

Outdoor

Power Supply

Oscillator Circuit

Voltage Comparator

RF

Transceiver

Wave Sensing Unit

Data Lines

Power Lines

wave sensor4
Wave Sensor

Prototyping Plan

slide50

Wave Sensor

Block Parts Count Reliability

  • Total FITs: 11577 Total MTBF (years): 9.9
  • The MOS Digital ICs are most unreliable
  • R = 92.24%
poolside alarm block assignment5
Poolside Alarm Block Assignment

Peter

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

function
Function
  • To measure the current pool water and outdoor air temperature
  • To convert the temperature into a positive digital voltage to be sent to the MPU with an accuracy of ±3C (max) over a range of 5C to 55C
performance requirements2
Performance Requirements
  • Voltage
    • Power Consumption: <5 W
    • Supply = 3.3V ± 10%
    • Output = 3.3 V high, 0V low
      • A/D converter: 8-bit.
    • Input = 0 – 2.048 Vac
  • Current
    • Output < 25 mA
  • Accuracy
    • ±3C over full range
    • .195C / bit
  • EMC Standard:

61000-4-2 EMC Part 4: Test/measurement techniques for ESD immunity tests

standard requirements2
Mechanical

Block cost <$35

Parts count <25

Unique parts count <8

PCB Area 50 cm2

Environment:

Operating temperature range

Water 5 to 55 C

Air 5 to 55C

Storage temperature range -20C to 65C

Operating humidity 0 to 100%

Life Cycle

Reliability MTBF 403.5 years

R(1 Warranty) 99.8%

Disposal Throw away

Percent Allocations 14% of cost

16% of parts

12% of PCB area

Standard Requirements
block assignment1
Block Assignment

3.3 V

Power Supply

Temp

Sensors

Low-Pass Filter

(Passive)

Amplifier

A/D converter

8-Bit

Data Lines

Power Lines

RF Transceiver

slide58

Parts Count Reliability

  • Total Fits = 282.7, Total MTBF (yrs) = 403.5
  • R(30 day warranty) = e^(-0.8/403.5) * 100% = 99.8%
  • Dominant Failure part are the CMOS A/D converters. Not much can be done to improve these.
slide60
Motion Sensor

Louis Chatfield

poolside alarm block assignment6
Poolside Alarm Block Assignment

Louis

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

function1
Function
  • This block utilizes a passive motion IR motions signal which is when tripped by a person near a pool.
    • IR sensor detects body heat from a human sends a signal
  • The motion sensor sends a digital signal to the Outdoor MPU.
  • Once the Outdoor MPU receives this signal, it triggers the indoor and outdoor alarms.
performance requirements3
Performance Requirements
  • Power Inputs
    • DC Power 10 – 13 VDC
    • Current Draw <= 17 mA
  • Coverage Wide Angle
    • 40 ft x 40 ft (12m x 12m)
    • Actual Beam Coverage: 40 ft x 20 ft (12m x 6m)
  • Electrical Interfaces
    • Digital input from motion sensor
    • Digital signal is conveyed the outdoor MPU
  • Safety Standards:

UL 508C – Power Conversion Equipment

UL 2017 – General Purpose Signaling Devices and Systems

IEC 61000-4-2 – Electro Static Discharge

standard requirements3
Standard Requirements

Mechanical

  • Block cost <$30
  • % Cost Allocation 20%
  • Parts count <25
  • Unique parts count <5
  • PCB Area 60 cm2

Environment:

  • Operating temperature range 5 to 55 C
  • Storage temperature range -20C to 65C
  • Operating humidity 0 to 100%

Life Cycle

  • Reliability MTBF 28.3 years
  • Disposal Throw away
block diagram
Block Diagram

OUTDOOR

POWER SUPPLY

9V

PASSIVE IR SENSOR

9V – 16V

REGULATOR

12 VDC

POWER

POWER

POWER

OUTDOOR MPU

RF TRANSCEIVER

FILTER/ SMOOTHING

CIRCUIT

REGULATOR

3 V

SIGNAL

SIGNAL

SMOOTHING: KEEPS DC VARYING TO ONLY A SMALL RIPPLE

REGULATORS: ELIMINATES RIPPLE BY SETTING DC OUTPUT TO FIXED VOLTAGE

parts count reliability estimation
Parts Count Reliability Estimation

MTBF = 28.3 YEARS. RELIABILITY = 97 %

MOST DOMINANT PART RELATED TO UNREALIABILITY IS THE CAPACITORS

slide69

RF Transceiver

Milja Cumbo

poolside alarm block assignment7
Poolside Alarm Block Assignment

Milja

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

rf transceiver block purpose and description
RF Transceiver Block Purpose and Description
  • Block Purpose

To process and control data from sensors, power supplies, and switches

To transmit and receive data between outdoor and indoor units

  • Block Description

Read input digital signals from sensors into the Outside Controler

Send processed data to the Outdoor Transceiver

Control push button switch with debounce component and ESD

protection

Send processed digital signal to the Transceiver

Send/Receive wireless signal to/from the Transceiver

Send/Receive the data signal to/from the Indoor Controler

rf transceiver product performance requirements
RF TransceiverProduct Performance Requirements
  • Electrical Interfaces:
  • Different Signal types: Digital, DC Power Supply.
  • Different Signal Directions: Input, Output, Bi Directional
  • Input Current max: 24 mA
  • Output Nominal Voltage: 3.3 VDC

Output Current max: 24 mA

rf transceiver product safety requirements
RF TransceiverProduct Safety Requirements
  • UL 464 - Audible Signal Appliances
    • Electrically and electronically operated bells, buzzers, horns, and similar audible signal appliances intended for indoor or outdoor locations.
rf transceiver product standard requirements
RF TransceiverProduct Standard Requirements
  • Block cost <$40
  • Parts count <20
  • Unique parts count <5
  • PCB Area 50 cm2
  • Power consumption <5W
  • Operating temperature range 5 0C to 55 0C
  • Storage temperature range -20 0C to 65 0C
  • Reliability MTBF 31.36 yrs.
  • Operating humidity 0 to 100 %
  • Disposal Discard
emc standards summary

US/FCC:47 CFR 15 - Radio Frequency Devices 47 CFR 18 - Industrial Scientific and Medical Equipment 61000-3-3 EMC Part 3: Limits - Section 3: Limitation of voltage fluctuations and flicker

in low-voltage supplies <16A 61000-4-2 EMC Part 4: Test/measurement techniques - Section 2: ESD immunity tests 61000-4-3 EMC Part 4: Test/measurement techniques - Section 3: Radiated

radiofrequency immunity tests 61000-4-6 EMC Part 4: Test/measurement techniques - Section 6: Conducted

Radiofrequency immunity tests

CISPR:11 Limits and methods of measurement for Industrial, Scientific and Medical Equipment

16 Specifications for Radio Interference Measuring Apparatus and Measurement

Methods 22 Limits and Methods of Measurements of Radio Interference of Information

Technology Equipment

EMC Standards Summary
slide76

RF Transceiver Block Diagram

digital signals

digital signals

Alarm Activated

Alarm Deactivated

Low Battery

Power ON/OFF

Alarm Deactivated From Inside

Water Sensor

Motion Sensor

Outside Controller

AirTemp.Sensor

WaterTemp Sensor

Power ON/OFF

Low Battery

Outdoor

Transceiver

Indoor Transceiver

Outdoor Antenna

Indoor Antenna

rf transceiver parts count reliability
RF Transceiver Parts Count Reliability

The most unreliable part is Mos Dig IC <1000 gates(2938.24). The number of the gates cannot change.

slide82

Alarms

Louis Chatfield

poolside alarm block assignment8
Poolside Alarm Block Assignment

Louis

Outdoor

Indoor

Power Supply

Power Supply

Alarm

Air / Water

Sensor

RF

Transceiver

Wave

Sensor

Indoor MPU and Display

Motion

Sensor

Data Lines

Power Lines

Alarm

functionality
Functionality
  • Purpose: To sound an alarm.
  • Description:
    • Siren/horn produces a high decibel audible sound (at least 100 dB)
    • Siren/horn needs to notify the surrounding area there is a possibility of a child jumping into an unsupervised pool.
performance requirements4
Performance Requirements
  • Power Inputs
    • DC Power 2.55 – 3.3 VDC
    • Current Draw <= 0.7 A
  • Output
    • Max 101 dB at 10 feet
  • Electrical Interfaces
    • Digital output is sent from Indoor MPU
    • Digital signal is amplified via audio amplifier, which is sent to the siren/horn

Safety Standard:

  • UL 464 - Audible Signal Appliances
  • UL 1492 – Audio-Video Products and Accessories
  • IEC 61000-4-2 Electro Static Discharge Immunity
standard requirements4
Standard Requirements

Mechanical

  • Block cost <$10
  • % Cost Allocation ~7%
  • Parts count <10
  • Unique parts count <3
  • PCB Area 40 cm2

Environment:

  • Operating temperature range 5 to 55 C
  • Storage temperature range -20C to 65C
  • Operating humidity 0 to 100%

Life Cycle

  • Reliability MTBF 75.2 years
  • Disposal Throw away
motion sensor diagram
Motion Sensor Diagram

3.3 V DIGITAL SIGNAL

AMPLIFIED SIGNAL

INDOOR

MPU

AUDIO

AMPLIFIER

SIREN/HORN

count reliability estimation
Count Reliability Estimation

MTBF = 75.2 YEARS.RELIABILITY = 99 %

MOST DOMINANT PART RELATED TO UNREALIABILITY IS THE CAPACITORS

reliability assessment
Reliability Assessment
  • F(w) = 0.04 = 4% failures within the warranty period of 30 days.
  • R(w) = 0.96 = 96% reliability within the warranty period.
  • To get a reliability of R(w) = 99%, we found that we had to reduce our warranty to t = 0.02 or 7 days.
  • Our group decided to stick with the 30 day warranty so that consumers would have more confidence in our product.
reliability summary
Reliability Summary
  • Most Unreliable Parts
      • CPLD
      • NPN Phototransistor
      • LM 555 IC
      • Relay
      • LM 3909 IC
      • Electrolytic Outdoor Capacitor
      • Mos Dig IC < 1000 Gates – Outdoor
      • Photovoltaic Cells
  • Improvements
    • Can research and maybe choose better qualified parts for low reliability components
    • Could buy higher efficient components, but would be much more costly.
    • Protect against voltage and current swings so parts do not get close to their max ratings.
reliability growth plan outside
Reliability Growth Plan - Outside

- We are probably not going to test these prototypes for these types of tests except the input voltage cycles. We will probably test all prototypes for this. The other requires an environmental chamber and the G-force one could be destructive.

reliability growth plan outside1
Reliability Growth Plan - Outside

- We are probably not going to test these prototypes examples for these types of tests except the input voltage cycles. We will probably test all prototypes for this. The other requires an environmental chamber and the G-force one could be destructive.

ad